Will my 4.3L transmission bolt up to a 350 ???

DIRTRIDER56 · 10-19-2009, 02:54 PM

Will my 2000 4.3L Xtreme transmossion bolt up to a 350 crate motor? I know the 4.3 is the same block and all as a 350 minus 2 cyclinders anyone have a clue ???

SH-60B · 10-20-2009, 12:00 AM

It'll bolt to both a small block & a big block. IDK how long it will live, maybe indefinitly, depends on how powerful your smallblock is.

carter · 10-20-2009, 01:32 AM

2 of my friends have swaps done, 5.3L cammed, tuned and a LS2 with alot of work done to it...and all they did was increase the shift pressures and they've both held up for 2 years now...i did the same and havent had ANY slipping or any problems what so ever.

Maverick2664 · 10-20-2009, 01:37 PM

you can use it, but i would buy some better internals for it before you do, especially if you plan to beat the truck... and who with a v8 s10 doesnt....

BLACKBULLET69 · 10-20-2009, 08:38 PM

do u know about wht horsepower these trans will last to?

DIRTRIDER56 · 10-20-2009, 09:00 PM

alright thanks guys im puttin a chevy 350 crate motor with heads and a cam its pushin around 400hp so i hope this tranny will last and i was planning on gettin a shift kit for it as well.

Maverick2664 · 10-21-2009, 01:54 PM

well good luck with that, my 383 so far has eaten 2 TH350's and those are typically stronger than whats behind the 4.3

and btw, a shift kit is harder on the tranny than stock, it shortens its lifespan, not lengthens it

wingman98 · 10-21-2009, 05:10 PM

the transmission is a 4L60E, it is basically the same transmission as 700r4 except it is electronically controlled. the 4L60E has a design flaw internally, it has a grounding problem and does not stand up to horsepower very well. i know this because my dad, brother and, i have pulled 7 or 8 of them out of my dads caprice, it has a LT1 in it. the transmission shop we now use has one man that rebuilds these transmissions. i would advise having the transmission rebuilt if it is going to have that much horsepower in front of it.

S15vortecpwr · 10-21-2009, 10:53 PM

its not really the hp that crushes these trannies, it is more RPM's they are only designes for 6250 or so. If you are planning to turn your 350 to 7k or so than you will need better internals.

SH-60B · 10-23-2009, 11:21 AM

I never heard that. The input shaft or sun shell can break from high RPM? How? They aren't balanced? The only reason to keep spinning to 7K is if your power is still climbing, so in that case more RPM = more power.

Maverick2664 · 10-23-2009, 12:30 PM

im not really buying the rpm thing either... im sure it has something to do with wear, but as far as breaking internals, that honor goes to power and torque

like i said, my 383 has been through a couple th350's, and it rarely sees more than 5500 rpm, doesnt need to, all the power is down low

10-19-2009, 02:54 PM	#1
DIRTRIDER56 Registered User Age: 19 Join Date: Oct 2009 Posts: 14 Location: CLARKSVILLE, TN User is: OffLine	Will my 4.3L transmission bolt up to a 350 ??? Will my 2000 4.3L Xtreme transmossion bolt up to a 350 crate motor? I know the 4.3 is the same block and all as a 350 minus 2 cyclinders anyone have a clue ???
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10-20-2009, 12:00 AM	#2
SH-60B Registered Neanderthal Join Date: Nov 2007 Posts: 2,335 Location: Meriden/CT/USA User is: OffLine	Re: Will my 4.3L transmission bolt up to a 350 ??? It'll bolt to both a small block & a big block. IDK how long it will live, maybe indefinitly, depends on how powerful your smallblock is.
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10-20-2009, 01:32 AM	#3
carter Registered User Age: 20 Join Date: Feb 2006 Posts: 232 Location: Calgary User is: OffLine	Re: Will my 4.3L transmission bolt up to a 350 ??? 2 of my friends have swaps done, 5.3L cammed, tuned and a LS2 with alot of work done to it...and all they did was increase the shift pressures and they've both held up for 2 years now...i did the same and havent had ANY slipping or any problems what so ever.
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10-20-2009, 01:37 PM	#4
Maverick2664 Heavy Metal Body Man Age: 25 Join Date: Jun 2007 Posts: 2,846 Location: Erie PA User is: OffLine	Re: Will my 4.3L transmission bolt up to a 350 ??? you can use it, but i would buy some better internals for it before you do, especially if you plan to beat the truck... and who with a v8 s10 doesnt....
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10-20-2009, 08:38 PM	#5
BLACKBULLET69 Registered User Join Date: Apr 2009 Posts: 85 Location: Tinicum, P.A - Delco User is: OffLine	Re: Will my 4.3L transmission bolt up to a 350 ??? do u know about wht horsepower these trans will last to?
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10-20-2009, 09:00 PM	#6
DIRTRIDER56 Registered User Age: 19 Join Date: Oct 2009 Posts: 14 Location: CLARKSVILLE, TN User is: OffLine	Re: Will my 4.3L transmission bolt up to a 350 ??? alright thanks guys im puttin a chevy 350 crate motor with heads and a cam its pushin around 400hp so i hope this tranny will last and i was planning on gettin a shift kit for it as well.
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10-21-2009, 01:54 PM	#7
Maverick2664 Heavy Metal Body Man Age: 25 Join Date: Jun 2007 Posts: 2,846 Location: Erie PA User is: OffLine	Re: Will my 4.3L transmission bolt up to a 350 ??? well good luck with that, my 383 so far has eaten 2 TH350's and those are typically stronger than whats behind the 4.3 and btw, a shift kit is harder on the tranny than stock, it shortens its lifespan, not lengthens it
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10-21-2009, 05:10 PM	#8
wingman98 Registered User Age: 18 Join Date: Oct 2009 Posts: 2 Location: User is: OffLine	Re: Will my 4.3L transmission bolt up to a 350 ??? the transmission is a 4L60E, it is basically the same transmission as 700r4 except it is electronically controlled. the 4L60E has a design flaw internally, it has a grounding problem and does not stand up to horsepower very well. i know this because my dad, brother and, i have pulled 7 or 8 of them out of my dads caprice, it has a LT1 in it. the transmission shop we now use has one man that rebuilds these transmissions. i would advise having the transmission rebuilt if it is going to have that much horsepower in front of it.
	[Reply w/Quote]

10-21-2009, 10:53 PM	#9
S15vortecpwr goin broke but n style Age: 29 Join Date: Jan 2007 Posts: 3,071 Location: Wetumpka, Alabama User is: OffLine	Re: Will my 4.3L transmission bolt up to a 350 ??? its not really the hp that crushes these trannies, it is more RPM's they are only designes for 6250 or so. If you are planning to turn your 350 to 7k or so than you will need better internals.
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10-23-2009, 11:21 AM	#10
SH-60B Registered Neanderthal Join Date: Nov 2007 Posts: 2,335 Location: Meriden/CT/USA User is: OffLine	Re: Will my 4.3L transmission bolt up to a 350 ??? I never heard that. The input shaft or sun shell can break from high RPM? How? They aren't balanced? The only reason to keep spinning to 7K is if your power is still climbing, so in that case more RPM = more power.
	[Reply w/Quote]

10-23-2009, 12:30 PM	#11
Maverick2664 Heavy Metal Body Man Age: 25 Join Date: Jun 2007 Posts: 2,846 Location: Erie PA User is: OffLine	Re: Will my 4.3L transmission bolt up to a 350 ??? im not really buying the rpm thing either... im sure it has something to do with wear, but as far as breaking internals, that honor goes to power and torque like i said, my 383 has been through a couple th350's, and it rarely sees more than 5500 rpm, doesnt need to, all the power is down low Last edited by Maverick2664 : 10-23-2009 at 12:32 PM.
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